Yes, well, perhaps I should provide a more conclusive code sample, here it is: ctrlv.it/latex/MzA4MzA5, and oddly enough your example compiled on my system; concluding it has to be related to one of my settings, but which one and why ?! Thank you Heiko.
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Lucian GoronSep 5 '12 at 16:11

The example runs without error here. Strip the example down until you know, where the culprit is, update the package(s) and try again.
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Heiko OberdiekSep 5 '12 at 19:08

I found the problem area. Commented the part with {pgfplots}, i.e. ctrlv.it/id/MzA4NDIx, and it compiled with no error. Unfortunately, I need that {gauss} function. Is there any workaround for this issue ?
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Lucian GoronSep 6 '12 at 15:16

Does anybody know a solution for this problem ?
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Lucian GoronSep 22 '12 at 12:26